Chemical Reaction – Milk Glue

Chemical Reaction – Milk Glue

srpglue

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What You Need:

  • Milk
  • Vinegar
  • Baking Soda
  • Coffee Filter or Paper Towel
  • 2 Large Cups
  • Bowl
  • Spoon

Pour 1/2 cup of milk into a large cup. Add 2 teaspoons srpmilkglassvinegar. Mix. Place a coffee filter or paper towel over a second large cup. The coffee filter should sag a little bit to make a little filter bowl. Put a rubber band around the top of the cup so it holds the coffee filter in place. Now pour the milk/vinegar mixture into the filter bowl you made.

Let the liquid part of the mixture drip through the filter. This might take awhile. When the liquid is done dripping use a spoon to scrape the milky lumps off the coffee filter and into a bowl. Add 1/4 teaspoon baking soda to the lumps and mix. Is this substance getting sticky? Try it out – can you use it to glue two pieces of paper together?

When the milk and vinegar (an acid), mix together a chemical reaction takes place. A substance called Casein forms. Casein is a very long molecule that bends like plastic – that’s why the lumps of milk are pliable and bendy. When you add baking soda (a base) to the milk lumps another chemical reaction happens turning the milk lumps into a sticky glue.

Science Experiment Idea: Make three batchs of milk glue, but make the variable (the thing you change) the amount of baking soda you add to the mixture. If you add 1/8 teaspoon baking soda to one batch, 1/4 teaspoon baking soda to one batch and 1/2 teaspoon baking soda to one batch, which one will be the most sticky? Why do you think so?

Here are some books and website that will help you make and understand glue made from milk:

Naked Eggs and Flying Potatoes Milk and Cheese

Words to Know:

Chemical Reaction – When a substances or substances is changed into a new substance.
Acid – A chemical that is often sour tasting and corrosive. It dissolves some things.

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7 Responses »

  1. My step-daughter is doing a science project and will be using this as one of her examples of chemical reactions. We’ve learned there are 6 types of chemical reactions, which type is this? I’ve Googled it but can’t find the answer anywhere!

  2. I am not absolutely sure which type of chemical reaction this is.

    The Six Types Are:
    1. Combustion Reaction…something burns
    2. Synthesis Reaction…simple compounds are joined to make a complex one
    3. Decomposition Reaction…molecules are broken apart into simpler ones
    4. Single Displacement Reaction…elements switch places
    5. Double Displacement Reaction…two compounds switch places
    6. Acid/Base Reaction…a double displacement reaction where one of the compounds is water.

    If you go to this page https://chemfiesta.org/2015/09/08/the-six-types-of-reaction/ and scroll down…there is a section “How to tell which type of reaction you’ve got” which might be helpful! My guess is number 6…but that is just a guess – run this one by your science teacher!

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